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I need help to repair PC Speed Wheel Game device

Dear Friends:
I am searching how to diagnostic and repair a Genius Speed Wheel Force
Feedback PC game device. The wheel is working, but when I turn on the
force effect simulator, the wheel rotates by itself (out of user
control)until reaches the right top and stays there. I have checked
conectors, power supply, voltage regulators, and of course software
installation. I suppose it is necesary to check out microprocessor
control signals driving power transistors, but I haven´t circuit
diagrams.
I would appreciate any circuit, technical data, or suggestion.
My best regards.
Roberto
 
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